/**
 * @description 导出excel
 * 使用示例
 *  import('@/utils/exportExcel').then(excel => {
 *     const tHeader = ['账号', '金额', '原因']
 *     const filterVal = ['cardNumber', 'advanceAmount', 'msg']
 *     const data = formatJson(filterVal, [{ cardNumber: xx, advanceAmount: xx  }])
 *     excel.export_json_to_excel({
 *       header: tHeader,
 *       data,
 *       filename: '验证失败卡号',
 *       autoWidth: true,
 *       bookType: 'xlsx'
 *     })
 *   })
 * */
import { saveAs } from 'file-saver'
import { utils, SSF, write, type BookType } from 'xlsx'

// 定义 Excel 单元格接口
interface ExcelCell {
  v: string | number | boolean | Date | null // 单元格值
  t?: string // 单元格类型
  z?: string // 格式化字符串
}

// 定义合并单元格范围
interface MergeRange {
  s: { r: number; c: number }
  e: { r: number; c: number }
}

function generateArray(
  table: HTMLTableElement,
): [Array<Array<string | number | null>>, MergeRange[]] {
  const out: Array<Array<string | number | null>> = []
  const rows = table.querySelectorAll('tr')
  const ranges: MergeRange[] = []
  for (let R = 0; R < rows.length; ++R) {
    const outRow: Array<string | number | null> = []
    const row = rows[R]
    const columns = row.querySelectorAll('td')
    for (const cell of columns) {
      const colspan = cell.getAttribute('colspan')
      const rowspan = cell.getAttribute('rowspan')
      let cellValue: string | number = cell.innerText
      if (cellValue !== '' && !isNaN(Number(cellValue))) cellValue = Number(cellValue)
      ranges.forEach((range) => {
        if (
          R >= range.s.r &&
          R <= range.e.r &&
          outRow.length >= range.s.c &&
          outRow.length <= range.e.c
        ) {
          for (let i = 0; i <= range.e.c - range.s.c; ++i) outRow.push(null)
        }
      })
      if (rowspan || colspan) {
        const rowspanNum = rowspan ? parseInt(rowspan) : 1
        const colspanNum = colspan ? parseInt(colspan) : 1
        ranges.push({
          s: {
            r: R,
            c: outRow.length,
          },
          e: {
            r: R + rowspanNum - 1,
            c: outRow.length + colspanNum - 1,
          },
        })
      }

      outRow.push(cellValue !== '' ? cellValue : null)

      if (colspan) {
        const colspanNum = parseInt(colspan)
        for (let k = 0; k < colspanNum - 1; ++k) outRow.push(null)
      }
    }
    out.push(outRow)
  }
  return [out, ranges]
}

function datenum(v: string | Date, date1904: boolean | null = null): number {
  let dateValue = v
  if (date1904) {
    dateValue = new Date(new Date(v).getTime() + 1462 * 24 * 60 * 60 * 1000)
  }
  const epoch = Date.parse(dateValue.toString())
  return (epoch - Date.UTC(1899, 11, 30)) / (24 * 60 * 60 * 1000)
}

function sheet_from_array_of_arrays(
  data: Array<Array<string | number | boolean | null>>,
): Record<string, ExcelCell | string | MergeRange[] | Array<{ wch: number }>> {
  const ws: Record<string, ExcelCell | string | MergeRange[] | Array<{ wch: number }>> = {}
  const range = {
    s: {
      c: 10000000,
      r: 10000000,
    },
    e: {
      c: 0,
      r: 0,
    },
  }
  for (let R = 0; R !== data.length; ++R) {
    for (let C = 0; C !== data[R].length; ++C) {
      if (range.s.r > R) range.s.r = R
      if (range.s.c > C) range.s.c = C
      if (range.e.r < R) range.e.r = R
      if (range.e.c < C) range.e.c = C
      const cell: ExcelCell = {
        v: data[R][C],
      }
      if (cell.v === null) continue
      const cellRef = utils.encode_cell({
        c: C,
        r: R,
      })

      if (typeof cell.v === 'number') cell.t = 'n'
      else if (typeof cell.v === 'boolean') cell.t = 'b'
      else if (cell.v instanceof Date) {
        cell.t = 'n'
        cell.z = SSF._table[14]
        cell.v = datenum(cell.v)
      } else cell.t = 's'

      ws[cellRef] = cell
    }
  }
  if (range.s.c < 10000000) ws['!ref'] = utils.encode_range(range)
  return ws
}

class Workbook {
  public SheetNames = []
  public Sheets = {}
}

function s2ab(s: string): ArrayBuffer {
  const buf = new ArrayBuffer(s.length)
  const view = new Uint8Array(buf)
  for (let i = 0; i !== s.length; ++i) view[i] = s.charCodeAt(i) & 0xff
  return buf
}

export function export_table_to_excel(id: string) {
  const theTable = document.getElementById(id) as HTMLTableElement
  if (!theTable) {
    throw new Error(`Table with id "${id}" not found`)
  }
  const oo = generateArray(theTable)
  const ranges = oo[1]

  const data = oo[0]
  const wsName = 'SheetJS'

  const wb = new Workbook()
  const ws = sheet_from_array_of_arrays(data)

  ws['!merges'] = ranges

  wb.SheetNames.push(wsName)
  wb.Sheets[wsName] = ws

  const wbout = write(wb, {
    bookType: 'xlsx',
    bookSST: false,
    type: 'binary',
  })

  saveAs(
    new Blob([s2ab(wbout)], {
      type: 'application/octet-stream',
    }),
    'test.xlsx',
  )
}

interface ExportExcelOptions {
  multiHeader?: string[][]
  header: string[]
  data: Array<Array<string | number | boolean | null>>
  filename?: string
  merges?: string[]
  autoWidth?: boolean
  bookType?: BookType
}

export function export_json_to_excel(options: ExportExcelOptions) {
  const {
    multiHeader = [],
    header,
    data,
    filename = 'excel-list',
    merges = [],
    autoWidth = true,
    bookType = 'xlsx',
  } = options

  /* original data */
  const processedData = [...data]
  processedData.unshift(header)

  for (let i = multiHeader.length - 1; i > -1; i--) {
    processedData.unshift(multiHeader[i])
  }

  const wsName = 'SheetJS'
  const wb = new Workbook()
  const ws = sheet_from_array_of_arrays(processedData)

  if (merges.length > 0) {
    if (!ws['!merges']) {
      ws['!merges'] = []
    }
    merges.forEach((item) => {
      ;(ws['!merges'] as MergeRange[]).push(utils.decode_range(item))
    })
  }

  if (autoWidth) {
    const colWidth = processedData.map((row) =>
      row.map((val) => {
        if (val === null) {
          return {
            wch: 10,
          }
        } else if (val?.toString().charCodeAt(0) > 255) {
          return {
            wch: val.toString().length * 2,
          }
        } else {
          return {
            wch: val?.toString().length || 0,
          }
        }
      }),
    )
    const result = colWidth[0]
    for (let i = 1; i < colWidth.length; i++) {
      for (let j = 0; j < colWidth[i].length; j++) {
        if (result[j]['wch'] < colWidth[i][j]['wch']) {
          result[j]['wch'] = colWidth[i][j]['wch']
        }
      }
    }
    ws['!cols'] = result
  }

  wb.SheetNames.push(wsName)
  wb.Sheets[wsName] = ws

  const wbout = write(wb, {
    bookType: bookType,
    bookSST: false,
    type: 'binary',
  })
  saveAs(
    new Blob([s2ab(wbout)], {
      type: 'application/octet-stream',
    }),
    `${filename}.${bookType}`,
  )
}
